Pick n Pay Tubatse Crossing Mall

I was not treated faily as a customer in Pick n Pay Tubatse Crossing Mall. On the 13th of October 2019 I went buy small grocery after paying on my way leaving the store I realised that one item was over priced, little did I know that if I go to a shelf where I found the over priced item and removed the price tag and give it to a supervisor I won't be assisted I won't have done that. The store refused to give me a discount based on the tag. Is this how Pick n Pay treat their customers by not giving them discount if a price on till differs with one on shelf?